I think they should just make everything out of NERF! NERF cars, NERF guard rails, NERF telephone poles, NERF trees, NERF deer etc. you get the idea. Forget stifness, let's make everyhting nice and soft to crash into! Canyon runs would be so much more enjoyable.HEHE
Seriously though, once they start putting foam in race cars, then I'll be a believer. Until then it's all aobut seam welding and caging. I believe Prodrive spends some 400+ manhours on a 22b shell to make it 3 times stiffer than stock. Then they bolt on all the unobtainium parts that make it a WRC.